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[mem.res.global]
20 Memory management library [mem]
20.5 Memory resources [mem.res]
20.5.4 Access to program-wide memory_resource objects [mem.res.global]
memory_resource* new_delete_resource() noexcept;
Returns: A pointer to a static-duration object of a type derived from memory_resource that can serve as a resource for allocating memory using ::operator new and ::operator delete.
The same value is returned every time this function is called.
For a return value p and a memory resource r,p->is_equal(r) returns &r == p.
memory_resource* null_memory_resource() noexcept;
Returns: A pointer to a static-duration object of a type derived from memory_resource for which allocate() always throws bad_alloc and for which deallocate() has no effect.
The same value is returned every time this function is called.
For a return value p and a memory resource r,p->is_equal(r) returns &r == p.
The default memory resource pointer is a pointer to a memory resource that is used by certain facilities when an explicit memory resource is not supplied through the interface.
Its initial value is the return value of new_delete_resource().
memory_resource* set_default_resource(memory_resource* r) noexcept;
Effects: If r is non-null, sets the value of the default memory resource pointer to r, otherwise sets the default memory resource pointer to new_delete_resource().
Returns: The previous value of the default memory resource pointer.
Remarks: Calling the set_default_resource andget_default_resource functions shall not incur a data race ([intro.races]).
A call to the set_default_resource function synchronizes with subsequent calls to the set_default_resource and get_default_resource functions.
memory_resource* get_default_resource() noexcept;
Returns: The current value of the default memory resource pointer.